3 Don Carlo Gnocchi Onlus Foundation, Milan, Italy.
4 Physical Medicine and Rehabilitation Unit, Azienda Policlinico Umberto I, Rome, Italy.
5 Physical Medicine and Rehabilitation Unit, Azienda Policlinico Umberto I, Rome, Italy; Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy.
6 Don Carlo Gnocchi Onlus Foundation, Milan, Italy; Department of Geriatrics, Neurosciences and Orthopaedics, Catholic University of the Sacred Heart, Rome, Italy.